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Spin susceptibility of stabilized \delta phase in the Pu-Ga alloy is studiedby measuring {69,71}^Ga NMR spectra and nuclear spin-lattice relaxation rate{69}T_{1}^{-1} in the temperature range 5 - 350 K. The shift ({69}^K) of the{69,71}^Ga NMR line and {69}^T_{1}^{-1} are controlled correspondingly by thestatic and the fluctuating in time parts of local magnetic field arisen atnonmagnetic gallium due to transferred hyperfine coupling with the nearest felectron environment of the more magnetic Pu. The nonmonotonic with a maximumaround 150 K behavior of {69}^K(T) \chi_{s,5f}(T) is attributed to thepeculiarities in temperature dependence of the f electron spin susceptibility\chi_{s,5f}(T) in \delta phase of plutonium. The temperature reversibilitybeing observed in {69}^K(T) data provides strong evidence for an electronicinstability developed with T in f electron bands near the Fermi energy andaccompanied with a pseudogap-like decrease of \chi_{s,5f}(T) at T<150 K. TheNMR data at high temperature are in favor of the mainly localized character of5f electrons in \delta phase of the alloy with characteristic spin-fluctuationenergy \Gamma(T) T^{0.35(5)}, which is close to $\Gamma(T) T^{0.5} predicted byCox et al. [J. Appl. Phys. 57, 3166 (1985)] for 3D Kondo-system above T_Kondo}.The dynamic spin correlations of 5f electrons become essential to consider for{69}^T_{1}^{-1}(T) only at T<100 K. However, no NMR evidences favoringformation of the static magnetic order in \delta-Pu were revealed down to 5K .Comment: 6 pages, 4 figure

physical review. b, condensed matter and materials physics

Spin susceptibility of Ga-stabilized<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>δ</mml:mi><mml:mtext>−</mml:mtext><mml:mi mathvariant="normal">Pu</mml:mi></mml:mrow></mml:math>probed by<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Ga</mml:mi><mml:mprescripts /><mml:none /><mml:mn>69</mml:mn></mml:mmultiscripts></mml:math>NMR

Spin susceptibility of Ga-stabilizedδ−Puprobed byGa69NMR